no fluid in reservoir due to leaking reservoir or slave cylinder
If a truck has a clutch brake it would only be used when coming to a complete stop. By pushing the clutch peddle completely to the floor you would apply the clutch brake. This stops the clutch disc from spinning making it easier to shift into 1st or reverse gear. Normal shifting while driving you would not need to or want to push the clutch peddle to the floor to activate the clutch brake.
It sounds like the clutch master cylinder or slave cylinder has gone bad.These are not that expensive to replace.
The Toyota would have more acceleration a= F/m if the mass of the of the Semi Truck is greater than the mass of the Toyota.
Well your clutch should be a hydraulic clutch system and if your pedal is stuck on the floor that would mean that there is possibly no fluid in your reservoir. The system might also need to be bled. To do this you need to fill your reservoir with fluid (brake fluid). Your reservoir is located on the left side of your brake master cylinder. On the right side of the transmission you will see your slave cylinder for your clutch. It will have a hard hydraulic line going into it, (looks like a brake line), and on that slave cylinder there is a little nipple that you can put a 8mm wrench on. Okay now for the bleeding process. You will need a buddy for this. Have your buddy sit in the driver seat and hold the clutch to the floor. When he has it all the way to the floor, open up that nipple and let the fluid, (or air), out. When the pressure slows tighten the nipple back up. Have your buddy let the clutch back out and repeat the process until you dont have any air coming out of that nipple. Should look like a solid stream of fluid with no bubbles. You may have to fill your reservoir half way through the process.
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I would say air in the line, or you need a new clutch
You should not attempt to replace the clutch yourself unless you have considerable mechanical skills. In this case, the problem is most likely that the spring holding the clutch pedal in place is broken.
First make sure the pedal itself is not getting hung up on anything, ie. the floormat, or the carpet. Next if you look where the pedal mounts to the firewall of the truck there should be a return spring that reaches from the framework of the mounting setup for the pedals to the pedal itself. If that is in place then you must address a hydraulic issue. Make sure the slave cylinder mounted on the transmission is extending properly when clutch is depressed. If the slave cylinder does not, the master cylinder, a broken line, or the slave cylinder itself would be the culprit. If the the slave cylinder checks out, try putting the vehicle in gear with the clutch stuck down. If you can do so without your foot on the clutch I would think the throwout bearing/pressure plate assembly is binding and not forcing the clutch fork back to return the clutch. If this is the case then you're looking at a clutch replacement.
if its hydraulic there could be air in your line. bleed your clutch and refill.
The estimated cost for parts and labor to replace the clutch on a 1993 Toyota Camry is between $1,260 and $1,687. This can be higher or lower depending on where a person lives.
A manual can; an automatic will not, as the 94 transmission will be electronically controlled, whereas the 86 would be mechanically controlled.
Bad clutch slave cylinder or failed soft hose from master to slave cylinder.